IR-part2

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Unformatted text preview: Informa)on Retrieval Introduc*on to Informa(on Retrieval Evalua*ng search engines Introduc)on to Informa)on Retrieval Sec. 8.6 Measures for a search engine §༊  How fast does it index §༊  Number of documents/hour §༊  (Average document size) §༊  How fast does it search §༊  Latency as a func*on of index size §༊  Expressiveness of query language §༊  Ability to express complex informa*on needs §༊  Speed on complex queries §༊  Unclurered UI §༊  Is it free? 68 Introduc)on to Informa)on Retrieval Sec. 8.6 Measures for a search engine §༊  All of the preceding criteria are measurable: we can quan*fy speed/size §༊  we can make expressiveness precise §༊  The key measure: user happiness §༊  What is this? §༊  Speed of response/size of index are factors §༊  But blindingly fast, useless answers won’t make a user happy §༊  Need a way of quan*fying u...
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This document was uploaded on 02/14/2014.

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